ive wondered about that myself, or what i actually thought about was using uv to split H2 into radicals, but you could take a 2 prong approach, excite the hydroxy carbon bond, and split the H2 , doing it all in the gas phase.
the potential problems i see are side reactions, for instance could the frequency needed also take off the amine group or break c-c bonds or something else sucky?
other potential problems are that in order to work, i would imagine youd have to do it at very low presure, else collisions would de-excite the radicals before they formed. and thirdly reaction rate vs. UV intenisty, would it be fast eneuogh to be practical?
ill try to get some numbers and report back.